1, 2, 4-benzothiadiazine 1, 1-dioxides having a heterocyclic ring fused to the &#34;b&#34; face thereof



United States Patent Scott J. Childress, Philadelphia, Pa., assignors to American Home Products Corporation, New York, N.Y., a corporation of Delaware No Drawing. Filed July 7, 1964, Ser. No. 380,933

Claims. (Cl. 260243) The present invention relates to pharmacologically active, novel 1,2,4-benzothiadiazine 1,1-dioxides having a heterocyclic ring fused to the b face thereof. The invention is also concerned with a process for making the claimed compounds. T

While the 1,2,4-benzothiadiazine 1,1-dioxide nucleus has been extensively investigated by pharmaceutical chemists who have attached thereto a large number of substituents in an effort to discover new therapeutically active compounds, few compounds are known which have a heterocyclic ring fused to the b face of said nucleus.

The claimed compounds having'the described novel molecular configuration exhibit various pharmacological effects as determined by standard test procedures in warm blooded animals. Thus particular compounds embraced by the present invention manifest diuretic, hypotensive and central nervous system stimulant activity. Said compounds are represented by the following formula:

i z /N o Y In the above formula, Z represents hydrogen, halogen,

preferably chlorine, and (lower) alkyl, preferably methyl; Y represents hydrogen, halogen, preferably chlorine, (lower)alkyl, preferably methyl, 2-alkoxy-l-pyrrolidinylsulfonyl, 2-alkoxy-piperidin-l-ylsulfonyl, and (2-ethoxyhexahydroazepin-l-ylsulfonyl). Q is a polymethylene group having from 3 to 5 carbon atoms therein. R is hydrogen or lower alkyl having from 1 to 5 carbons there- The novel compounds made available by the present invention are prepared by reacting a known aniline sulfonyl chloride with a known w-aminoalkyl acetal. The aniline sulfonyl halide is represented by the formula:

Z NHR A SOzX where Z and R are as defined above; X is'chlorine or bromine; and A is halogen, preferably bromine or chlorine, (lower) alkyl, or a sulfonyl halide group, preferably a sulfonyl chloride group. The formula of the w-aminoalkyl acetal is:

H N-QCH(OC H where Q is as previously defined.

The reaction whereby the claimed compounds are produced can proceed in either one of two routes, depending upon the precise nature of substituent A in the anilinesulfonyl halide (11). Where said substituent is inert with respect to the active hydrogen of the w-aminoalkyl acetal; i.e., Where it is not a sulfonyl halide group, the reaction proceeds between substantially stoichiometric amounts of the respective reactants, as follows:

3,277,086 Patented Oct. 4, 1966 ICC REACTION A In accordance with reaction A, a solution of an anilinesulfonyl halide (II) in an inert solvent such as dimethoxyethane, dioxane, or chloroform is added at room temperature to a solution of an u-aminoalkyl acetal (Ill) in a similar solvent. The resulting solution is diluted with water and acidified with a mineral acid such as hydrochloric acid. The acidified solution then is cooled to precipitate a solid product (I) which can be purified by recrystallizing from alcohol.

In the case where the aniline reactant (H) is a 3-substituted-aniline-4,6-disulfonyl halide; i.e., where substituent A also is a sulfonyl halide group, the reaction proceeds as shown below with the formation of an isolatable N,N- bis (w,w-diethoxyalkyl)-4,6-disulfamylaniline (IV):

REACTION B z i NHR In reaction B, a solution of an aniline sulfonyl halide in a solvent such as dioxane, chloroform, or dimethoxyethane is slowly added to .a solution containing a w-aminoalkyl acetal, and an acid scavenger such as triethylamine, in a similar solvent. The reaction medium is kept at room temperature and agitated for a few minutes. After this time, the reaction mass is diluted with Water and eX- tracted with chloroform. Next, the cholorform extracts are dried with a suitable drying agent; e.g., anhydrous magnesium sulfate. Following this drying procedure, the drying agent is removed and the solution is concentrated to dryness. The thus-obtained residue which consists mainly of the crude intermediate (IV) then is dissolved in ethanol. The resulting solution is acidified with a mineral acid such as hydrochloric acid and warmed to precipitate the solid product (I) which can be purified by recrystallizing from a mixture of dimethoxyethane and ethanol.

Where N-alkylated final products are desired (i.e., compounds having R lower alkyl), it is possible to start with the N-alkyl-anilino starting materials. For better yields, it is more advantageous to N-alkylate the final products in conventional fashion, by, for example, treating them in an inert polar solvent with a lower alkyl bromide or an alkali metal hydride, alkanolate or amide.

The 3-substituted aniline-4,6-disulfonylchloride starting material can be prepared by procedures described in the literature and preferably by the procedure in Monatsh. Chem. 48, 87 1927), wherein a meta-substituted aniline is treated with 10 to 20 parts by weight of a halosulfonic acid followed by the addition of 90 to 170 parts by Weight of sodium chloride- The reaction mass is heated at about 150 C. for about 2 hours following which the reaction mixture is poured into water and the resultant aniline sulfonyl halide precipitates.

Thestarting w-aminoalkyl acetals can be prepared by treating the corresponding w-haloalkyl acetals with sodium cyanide to replace the halogen atom by a cyano group which is then reduced to an amino group with lithium aluminum hydride.

The present invention is better illustrated by reference to the following examples. It is to be kept in mind that these examples are only given to generally show the processes leading to the new compounds and are not intended to limit the invention.

EXAMPLE 1.-PREPARATION OF 7-CHLORO-2,3, 10,10a-TETRAHYDRO S-METHYL-IH-PYRROLO [1,2-b] [1,2,4]BENZOTHIADIAZINE 5,5-DIOXIDE A solution of 3.0 g. of 2-amino-5-chloro-4methylbenzenesulfonyl chloride in dimethoxyethane was added to a solution of 2.0 g. w-aminobutyraldehyde diethylacetal and 2.0 g. of dirnethylaniline in dimethoxyethane.

action mixture became warm and slightly colored. After 10 minutes, the reaction mixture was diluted with water and acidified with hydrochloric acid. On cooling, there precipitated out 1.7 g. of solid which was crystallized from alcohol. The pure compound had a M.P. 214-216 Analysis.Calcd. for C H CIN O S: C, 48.42; H,

4.80; N, 1027; C1, 13.00; S, 11.75. Found: C, 48.13; H,

4.68; N, 9.74; Cl, 13.25; S, 11.4.

EXAMPLE 2.PREPARATION OF 8-CHLORO-7-(2- ETHOXY 1-PYRROLIDINYLSULFONYL)-2,3,10, IOa-TETRAHYDRO 1H-PYRROLO[1,2-b] [1,2,4] BENZOTHIADIAZINE 5,5-DIOXIDE A dimethoxyethane solution of 6.5 g. of 3-chloroaniline-4,6-disulfonylchloride was slowly added to a cold solution of 5.85 g. (0.044 In.) of w-aminobutyraldehyde diethylacetal in dimethoxyethane, containing 4.0 g. (0.04

m.) of triethylamine. The mixture was stirred for 10 min., diluted with water and extracted with chloroform.

The chloroform extracts were dried over anhydrous magnesium sulfate. After the drying agent was removed the solution was concentrated and the residue dissolved in ethanol. After a few drops of hydrochloric acid was added, the solution was warmed on a steam bath for 10 min. Solids were collected and recrystallized from a mixture of dimethoxyet-hane and ethanol, M.P. 170-2 C.

After a few drops of Products aminobutyraldehyde diethyl acetal. 2-anilinesullonyl chloride and maminovaleraldehyde diethyl acetal. 2amino-4,5-dimethylbenzene and w-aminobutyraldehyde diethylacetal. 2-amino-4,5-dimethylbenzene and w-aminovaleraldehyde diethyl acetal. 2amino-4,5-dimethylbenzene and wagilinocaproaldehyde diethyl ace a 2-bromo-3-ethyl, 7,8,9,10,10a,11-

hcxahydropyrido[1,2-b] [1,2,4] benzothiadiazine 5,5-dioxide.

8,9,10,11,11a,12-hexahydro-7H- azepino[1,2-b] [1,2,4] benzothiadiazine 5,5-dioxide.

3-chloro-8,9,10,11,11a,12-hexahydro-2-methyl-7H-azepino [1,2-b] [1,2,4] benzothiadiazine 2,3,10,IOa-tetrahydro-lH-pyrrclo [1,2,-b] [1,2,4] benzothiadiazine 5,5-dioxide. 7,8,9,10,10a,11-hexahydropyrido [1,2-b] [1,2,4] bcnzothiadiazine 5,5-dioxide. 7,8-dimethy1-2,3,10,10a-tetrahydr-1H-pyrrolc[1,2-b] [1,2,4] benzothiadiazine 5,5-dioxide. 2,3-dimethyl-7,8,9,10,10a,11-hexahydropyrido[1,2-b] [1,2,4] benzothiadiazine 5,5-dioxide. 3,4-dimethyl-8,9,10,10a,ll-hexahydro-7H-azepino[l,2-b] [1,2,4] benzothiadiazine 5,5-di0xide.

EXAMPLE 3.PREPARATION OF 8-CHLORO-7-(2- METHOXY 1 PYRROLIDINYLSULFONYL)-2,3, 10,IOaTETRAHYDRO-lH-PYRROLO-( 1,2-b) (1,2,4) 1,2,4) -BENZOTHIADIAZINE 5 ,5 -DIOXIDE 10 A dimethoxyethane solution of 6.5 g. of 3-chloroaniline 4,6-disulfonylchloride is slowly added to a cold solution of 5.85 g. of a-aminobutyraldehyde dimethylacetal in dimethoxyethane, containing 4.0 g. of acid scavenger. The

1 mixture is stirred for 10 min, diluted with water and 5 extracted with chloroform. The chloroform extract is dried over anhydrous magnesium sulfate. After the drying agent is removed, the solution is concentrated and the residue dissolved in methanol.

hydrochloric acid is added, the solution is warmed on a steam bath for 10 min. The product precipitates on cooling to room temperature.

When the procedure of Example 1 is applied to the starting materials listed below, the corresponding products hereinafter disclosed are obtained:

Starting Compounds The re- 2-amino-5-ethyl-4-bromobenzene sulfonyl bromide and w-arninm valeraldehydc diethyl acetal.

Z-anilinesulfonyl chloride and waminocaproaldehyde diethyl acetal.

2-amino-5-chlor0-4-methylbenzene and warninocaproaldehyde diethyl acetal.

products given hereinafter are obtained:

Starting materials Intermediates Final Products B-methylaniline-4,6-disulfonylchloride and 8-methyl-7-(Z-ethoxy-l-pyrrolidinylsulfonyl)- 2,3,10,lOa-tetrahydro-lH-pyrrololl w-aminobutyraldehyde diethyl acetal. disulfamylan 3-bromoaniline-4,6-disullonyl chloride and w-aminobutyraldehyde.

Aniline-4,6-disulfonyl chloride and w-aminovaleraldehyde diethyl acetal.

3-methylaniline-4,6-disulfonyl chloride and w-aminovaleraldehyde diethyl acetal.

3-chloroaniline-4,G-disulfonyl chloride and w-aminovaleraldehyde diethyl acetal.

3-bromoaniline-4,fi-disulionyl chloride and waminovaleraldehyde dicthyl acetal.

Aniline-4,6-disulfonyl chloride and w-amlnocaproaldehyde diethyl acetal.

3-methy1aniline-4,6-disulionyl chloride and w-aminocaproaldehyde.

3-chloroaniline-4,G-disulfonyl chloride and w-aminocaproaldehyde.

3-brcmoani1ine-4,6-disulfonyl chloride and w-aminocaproaldehyde.

3-bromo-N,N-bis (4,4-diethoxybutyl) 4,6-

disulfamylaniline.

N ,N -bis (4,4-diethoxypentyl) -4, fi-disullamyl aniline.

3- methy1-N,N-bis(4,4-diethoxypentyl)-4,6-

disulfamy laniline.

3-chloro-N,N-bis(4,4-diethoxypentyl)-4,6-

disuliamylaniline.

3-bromo-N,N-bis(4,4-dlethoxypentyl)-4,6-

disulfamylaniline.

N ,N -bis (4,4-diethoxyhexyl) -4,6-disul1a.my1

aniline.

3-methyl-N,N-bis(4,4-dlethoxyhexyl)-4,6-

disulfamylaniline.

3ch1oro-N,N-bis(4,4-diethoxyhexyl)4,6-

disulfamyl aniline.

3-bromo-N,N'-bis(4,4diethoxyhexyl)-4,6-

disulfamyl aniline.

3-(2-ethoxyhexahydroazepin-l-ylsulfonyl)- 8,9,10,11,11a,12-hexahydro-10-chlorc-7H- gacpigo[1,2-b][1,2,4]benzothiadiazine 5,5-

lOXl e 3-(2-ethoxyhexahydroazepin-l-ylsullonyl)- 8,9,10,11,1la,12rhexahydr0-10-br0mo-7 H- azepino[1,2-b][1,2,4]benzothiadinzine 5,5- dioxide.

As stated above, there can be prepared the corresponding N-alkylated compounds of which the following are representative:

2-bromo 11 ethyl-8,9,l0,1l,11a,12-hexahydro-7H- azepi no[l,2-b] [1,2,4]benzothiadiazine 5,5-dioxide; 3- ch1oro-8,9,10,11,11a,12-hexahydro 2,11 dimethyl 7H- azepino[1,2,4] [1,2,4]benzothiadiazine 5,5-dioxide; 10- ethyl-2,3,10,10a-tetrahydro 1H pyrro1o[l,2-b] [1,2,4] benzothiadiazine 5,5dioxide; 7,8,9,10,10a,l1-hexahydro- 10 butylpyrido[1,2b][1,2,4]benzothiadiazine 5,5 dioxide; IO- butyl 8-methyl-7-(Z-ethoxy-l-pyrrolidinyl-sulfonyl) -2,3,10,10a-tetrahydro 1H pyrrolo[1,2-b] [1,2,4] benzothiadiazine 5,5-dioxide; 2-bromo-3-(2-ethoxyhexahydropyridin 1 ylsulfonyl) 8,9,10,11,11a,12 hexahydro-11-ethylpyrido[1,2-b] 1,2,41benzothiadiazine 5 ,5 dioxide; 3-(2-ethoxyhexahydroazepin 1 ylsulfonyl)-8, 9,10,11,l1a,12-hexahydro 2 chloro-11-propyl-7H-azepino[l,2-b] [1,2,4]benzothiadiazine 5,5 dioxide; 3-(2- ethoxyhexahydroazepin 1 ylsulfonyl)-8,9,10,11,11a,12- hexahydro-Z-bromo-l l-butyl 1H azepino[l,2-b] [1,2,4] benzothiadiazine 5,5-dioxide.

The effective dosage of the present compounds can vary over a wide range from about 50 to about 500 milligram per day or more, administered in the form of tablets, pills, capsules or of injectable solutions with the proper solid or liquid carrier. As the present compounds can be placed in suitable dosage forms by pharmacist only one example is given of the various possible unit dosage forms.

In making the above tablet, the active ingredients are mixed with the lactose and part of the starch and granulated with a sufiicient quantity of paste made from the remainder of the starch. The granulated material is dried 6 at -50 C. and screened through mesh. Next the magnesium stearate is screened onto the granulation with which it is blended. Talblets are pressed therefrom with a suitable tabletting machine.

What is claimed is: 1. A compound of the formula:

wherein Q is a polymethylene group having from 3 to 5 canbon atoms therein; Y is selected from the group consisting of hydrogen, chloro, bromo, fluoro, (lower) alkyl, 2-(1ower) alkoxy-l-pyrrolidinyl sulfonyl, 2-(lower) alkoxy piperidin-l-ylsulfonyl and 2-(lower) alkoxyhexahydroazepin-l-ylsulfonyl; Z is selected from the group consisting of hydrogen, chloro, bromo, fluoro and (lower)alky1; R is selected from the group consisting of hydrogen and (lower)alky1 2. 7-chloro-2,3,10,10a-tetrahydro 8 (lower) alkyl- 1H-1pyrro1o[1,2-b] [1,2,4] benzothiadiazine 5 ,5 -dioxide.

3. 8-chloro 7 (2-loweralkoxy 1 pyrrolidinylsulfonyl)-2,3,10,IOa-tetrahydro 1H pyrrolo[1,2-:b] [1,2,4] benzot'hiadiazine 5,5-dioxide.

4. 8-chloro 7 (Z-ethoxy-l-pyrrolidinylsulfonyl)-2, 3,10,10a-tetrahydr0 1H pyrrolo[1,2-b][1,2,4]benzothiadiazine 5,5-dioxide.

5. 7-chloro-2,3,10,10a-tetrahydro 8 methyl-lH-pyrrolo[ 1,2413] [1,2,4] benzothiadiazine 5 ,5 -dioxide.

References Cited by the Examiner UNITED STATES PATENTS 2,965,655 12/1960 Novello 260-397] 2,970,154 1/ 1961 Werner 260397.7 3,163,643 12/1964 deStevens et al -260243 3,163,645 12/ 1964 deStevens et a1 260243 NICHOLAS S. RIZZO, Primary Examiner. 

1. A COMPOUND OF THE FORMULA: 